238 



BACTERIOLOGICAL METHODS 



Table II. Stock i Pee Cent. Solution (foe Dilutions) 



(i cc. disinfectant; 99 cc. distilled water) 



Solution A 



Seeding Tubes. — The seeding tubes are glass test-tubes i in. 

 in diam. and about 3 in. long, with round bottoms. In order to 



C23222& £(:s 



Fig. 84. — Block for holding the subculture tubes. — (Anderson &* McClintic, Hygiene 

 Laboratory Bulletin No. 82, U. S. Public Health Service ) 



measure the disinfectant into them they are placed in a suitable 

 wooden stand to receive them. We found it convenient to use a 

 wooden block containing six rows of fifteen holes each for the 

 disinfectant to be tested and a separate stand for the phenol con- 

 trols. The tubes are placed in the stand and each marked with 

 the strength of dilutio n it is to rnntain TVi^ rmura r.f u.v.c.c ^.,^ 



